Abstract
During the fast-filling of a high-pressure hydrogen tank, the temperature of hydrogen would rise significantly and may lead to failure of the tank. In addition, the temperature rise also reduces hydrogen density in the tank, which causes mass decrement into the tank. Therefore, it is of practical significance to study the temperature rise and the amount of charging of hydrogen for hydrogen safety. In this paper, the change of hydrogen temperature in the tank according to the pressure rise during the process of charging the high-pressure tank in the process of a 82-MPa hydrogen filling system, the final temperature, the amount of filling of hydrogen gas, and the change of pressure of hydrogen through the pressure reducing valve, and the performance of heat exchanger for cooling high-temperature hydrogen were analyzed by theoretical and numerical methods. When high-pressure filling began in the initial vacuum state, the condition was called the “First cycle”. When the high-pressure charging process began in the remaining condition, the process was called the “Second cycle”. As a result of the theoretical analysis, the final temperatures of hydrogen gas were calculated to be 436.09 K for the first cycle of the high-pressure tank, and 403.55 for the second cycle analysis. The internal temperature of the buffer tank increased by 345.69 K and 32.54 K in the first cycle and second cycles after high-pressure filling. In addition, the final masses were calculated to be 11.58 kg and 12.26 kg for the first cycle and second cycle of the high-pressure tank, respectively. The works of the paper can provide suggestions for the temperature rise of 82 MPa compressed hydrogen storage system and offer necessary theory and numerical methods for guiding safe operation and construction of a hydrogen filling system.
Highlights
Introduction published maps and institutional affilFaced with growing energy shortages, environmental pollution, ecological deterioration, the development of clean and efficient new energy is the only way to solve the above problems
In order to promote the practicality of the hydrogen energy economy, science researchers and energy policy experts from all over the world have carried out a lot of iations
During the filling of the hydrogen storage tank, the change of pressure in a large range makes the compressed hydrogen have a significant real gas effect with a certain temperature rise, so the hydrogen has throttling effect at different pipes and valve, which leads to a temperature rise of hydrogen gas
Summary
The hydrogen supplied at the pressure is compressed to 82 MPa through a compression process, and the hydrogen is stored in a high-pressure storage tank. This is a system that lowers the pressure and stores it in the buffer tank so the compression cycle can be repeated. Heat is generated during the compression process, storage process and the process of passing the pressure reducing valve. The first stage and second stage are compressors, and (1), (3), and (5) are heat exchangers, and (2), (4) are pressure reducing valves.
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